1. Melt butter in a saucepan, add the onion and sauté for 5 mins. Add the chopped tomato and cook for 2 mins. 2. Add the flour and stir for about 30 seconds. 3. Add the fish to the onion and tomato together with the parsley and bay leaf. Pour over the milk and season to taste. Simmer for about 4 mins until the fish is cooked through. Remove the bay leaf and stir in the cheese until melted.4. Divide the fish between the ramekin dishes (makes 4 to 6 portions according to size of dish) and top with the mashed potato.5. Brush beaten egg over the surface of the mashed potato.6. Cook in an oven pre-heated to 180C for 15 mins and finish off for a few mins under a pre-heated grill until golden.7. Decorate the pies with faces - children will enjoy designing their own if you give them a selection of vegetables.